dataflow: Account for probe handles being dropped #490
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The lifetime of a probe handle is not attached to any particular dataflow and users are free to connect them to streams of multiple dataflows. This PR handles the situation in which a probe handle is connected to two separate dataflows and one of them drops. Previously the handle would have its frontier stuck because the old handle wouldn't provide any updates anymore. The solution is that each handle keeps track of its own changes and removes them from the overall calculation on drop. Signed-off-by: Petros Angelatos <[email protected]>
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The lifetime of a probe handle is not attached to any particular dataflow and users are free to connect them to streams of multiple dataflows.
This PR handles the situation in which a probe handle is connected to two separate dataflows and one of them drops. Previously the handle would have its frontier stuck because the old handle wouldn't provide any updates anymore.
The implemented solution is that each handle keeps track of its own changes and removes them from the overall calculation on drop.